Danfoss AVP-F (003H6368) — self-acting differential pressure controller, PN 25, DN 50, for district heating and central heating systems. The AVP-F is the fixed-setpoint version of the AVP: the differential pressure is factory-preset and sealed (no adjustment handle), holding a constant differential pressure across the controlled circuit so that connected control valves keep their authority. Unlike the AVPB, the AVP-F is a differential-pressure controller only (no integrated flow limiter). kVS 25 m³/h; fixed differential-pressure setting 0.5 bar (factory-preset, sealed). Maximum differential pressure 16 bar; medium temperature 2–150 °C; leakage 0.05% of kVS (IEC 534). Valve body ductile iron EN-GJS-400-18-LT (GGG 40.3), valve seat stainless steel 1.4571, valve cone dezincing free brass CuZn36Pb2As, control diaphragm EPDM. Connection flange PN 25. Media: circulation water / glycolic water up to 30% (pH 7–10). OEM P/N 003H6368, EAN 5702421539057. Technical data quoted verbatim from the Danfoss AVP PN 25 (VD.55.W6.02) data sheet and store.danfoss.com (code 003H6368). differential pressure 16 bar); Temperature range: 2 – 150 °C (medium); HS code: 8481.80. Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.